Granted Patent
Utility
US 5,969,869 · App. 08/957,745
Prism
Inventors:
Isamu Hirai, Etsuro Nishio, Yutaka Kamijo
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Oct 24, 1997
Inventors
Isamu Hirai
Etsuro Nishio
Yutaka Kamijo
Assignee (at issue)
Asahi Kogaku Kogyo Kabushiki Kaisha
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.